about.css

.navbar {
  width: 100%;
  height: 70px; 
  margin: 10px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: black;
  position: relative;
}

.logo {
  height: 100%;
  width: auto;
  border: none;
  position: absolute;
  left: 10px;
}

.navbar ul {
  padding: 0;
  margin: 0;
  list-style: none;
  display: flex;
}

.navbar ul li {
  margin: 0 20px;
  position: relative;
}

.navbar ul li a {
  text-decoration: none;
  color: rgba(240, 255, 255, 0.925);
  text-transform: uppercase;
}

.navbar ul li::after {
  content: '';
  height: 3px;
  width: 0;
  background: #009688;
  position: absolute;
  left: 0;
  bottom: -10px;
  transition: 0.5s;
}

.navbar ul li:hover::after {
  width: 100%;
}


@media (max-width: 768px) {
  .navbar {
      height: 50px; 
      flex-direction: column;
      align-items: flex-start;
      padding: 10px;
  }

  .logo {
      position: relative;
      left: 0;
      margin-bottom: 10px;
  }

  .navbar ul li {
      margin: 0;
      padding: 10px 0;
  }
}


@media (min-width: 769px) {
  .navbar {
      height: 70px; 
      padding: 0;
  }

  .navbar ul li {
      margin: 0 20px;
      padding: 0;
  }
}